<template>
  <div class="upload-file">
    <el-upload
      multiple
      :disabled="onlyShow"
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">选取文件</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
        <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li :key="file.url" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
        <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action" v-if="!onlyShow">
          <el-link :underline="false" @click="handleDelete(index,file.fId)" type="danger">删除</el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import request from '@/utils/request'
import {tokenName, baseURL} from '@/config';
import store from "@/store";

export default {
  props: {
    // 数量限制
    limit: {
      type: Number,
      default: 10,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 30,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc","docx","xls",'xlsx',"zip","rar","ppt","txt","pdf","log","ini","png","jpg","jpeg","mp3","mp4","avi","flv"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    // 业务类型
    entityTypeId: {
      type: Number,
      default: 0
    },
    // 业务Id
    entityId: {
      type: Number,
      default: 0
    },
    onlyShow:{
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      baseUrl: baseURL,
      uploadFileUrl: baseURL + "/common/upload", // 上传文件服务器地址
      headers: {
        [tokenName] : store.getters['user/accessToken'],
        entityTypeId: ''+this.entityTypeId,
        entityId: ''+this.entityId,
      },
      fileList: [],
    };
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  mounted(){
    this.initFileList();
  },
  methods: {
    initFileList(){
      if(this.entityId > 0){
        request({
          url: '/common/listfile/' + this.entityTypeId + "/" + this.entityId,
          method: 'get'
        }).then((res)=>{
          if(res.data && Array.isArray(res.data)){
            res.data.forEach(f=>{
              this.fileList.push({name: f.filePath, url: f.filePath,fId : f.fId })
            })
          }
        })
      }
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        const fileName = file.name.split('.');
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
          this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`);
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError("上传文件失败，请重试");
      this.$modal.closeLoading()
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (parseInt( res.code) === 200) {
        const {data} = res;
        this.uploadList.push({ name: data.fileName, url: data.fileName, fId:data.fId });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.fileUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除文件
    handleDelete(index,fId) {
      request({
        url: '/common/deletefile/' + fId,
        method: 'post'
      }).then( () =>{
        this.fileList.splice(index, 1);
        this.$emit("input", "");
      })
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", "");
        this.$modal.closeLoading();
      }
    },
    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
      } else {
        return "";
      }
    },
  }
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
